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Unbiased estimates of coefficients of variation for asbestos counting determined from Johns-Manville data.

Authors
Busch-KA; Hornung-RW; Smith-RJ; Leidel-NA
Source
Dusts and Disease, Proceedings of the Conference on Occupational Exposures to Fibrous and Particulate Dust and their Extension into the Environment, Sponsored by the Society for Occupational and Environmental Health and U.S. Mine Safety and Health Administration; R. Lemen, and J. M. Dement, editors, Park Forest South, Illinois, Pathofox Publisher, Inc. 1979 Jan; :185-197
Link
NIOSHTIC No.
00096291
Abstract
A statistical model for determining the relationship between the coefficient of variation (CV) and total fiber count of asbestos (1332214) fibers is described. The model is applied to data from 109 asbestos fiber measurements. The CV declines with increasing average total fibers counted and is related to fiber density. The NIOSH recommended asbestos sampling and counting procedure provides fiber concentration estimates within about 23 percent of the true concentration 95 percent of the time. The authors suggest that samples should be collected for as long as necessary to obtain sufficient surface fiber density on the filter; the average number of fibers per field counted should be close to 1.
Keywords
Fibrous-bodies; Estimating; Mathematical-models; Air-contamination; Air-sampling; Asbestos-dust; Fibrous-dusts; Minerals; Measurement-methods; Analytical-methods;
CAS No.
1332-21-4;
Publication Date
19790101
Document Type
Conference/Symposia Proceedings
Editors
Lemen-R; Dement-JM
Fiscal Year
1979
NTIS Accession No.
NTIS Price
ISBN No.
0930376080
NIOSH Division
OECSP; DTS
Source Name
Dusts and Disease, Proceedings of the Conference on Occupational Exposures to Fibrous and Particulate Dust and their Extension into the Environment, Sponsored by the Society for Occupational and Environmental Health and U.S. Mine Safety and Health Administration; R. Lemen, and J. M. Dement, editors, Park Forest South, Illinois, Pathofox Publisher, Inc.
State
IL; DC
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